356 Seadrift Rd
Stinson Beach 94970 · Stinson Beach · Unincorporated Marin · Coordinates: 37.90678, -122.67804
Executive Verdict · Public-Records Synthesis
Zoned C-RSPS-1.4 in Unincorporated Marin with likely ministerial ADU eligibility and mapped FEMA VE flood / Alquist-Priolo fault due diligence; benchmark value $3,287,000 ($2,893,000–$3,681,000).
Upsides & Opportunities
- ✓ Ministerial ADU / JADU pathway likely eligible
Zone C-RSPS-1.4 allows residential use qualifying for ministerial ADU review under state law.
Source: Unincorporated Marin zoning · CA Gov. Code 66314
- ✓ 4 documented municipal building permits on file
On-parcel permit history is indexed through Oct 15, 2026, letting you verify roof, HVAC, electrical, or structural work against seller disclosures.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
Watchouts & Due Diligence
- ! FEMA Special Flood Hazard Area (VE, about 98% of the lot of lot)
Zone VE: 1% annual chance flood (Special Flood Hazard Area) overlaps this parcel. Expect mandatory flood insurance for federally backed loans and floodplain elevation/mitigation rules for new units or SB 9 applications.
Source: FEMA National Flood Hazard Layer (parcel polygon)
- ! Alquist-Priolo Earthquake Fault Zone (all of the lot of lot)
Intersects a State-mapped surface fault rupture zone. Adding habitable structures or subdividing typically requires a site-specific geologic fault investigation.
Source: California Geological Survey Alquist-Priolo Zones
- ! Delayed or open permit activity on this parcel
New garage / accessory structure (84622): Pending in review for 7 yr (15.6× the 164d median) — slower than 90% of new garage / accessory structure permits in Unincorporated Marin (median 164d, 90th pct 485d, n=356).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (review-time benchmark)
- ! 4 slow or stalled nearby projects within ½ mile
Closest lead: New home at 52 Crescente Ave (0.35 mi W, applied). Inspect timeline history before assuming near-term completion.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · HCD APR (½-mile radius)
Parcel & Assessor
- Lot size:
- 28,401 sq ft (0.65 ac)
- Assessor use:
- Single-Resid. - Improved
- Addresses on lot:
- 356 SEADRIFT RD
Zoning & Land Use
C-RSPS-1.4 — Residential Single Family Planned (Unincorporated Marin)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned C-RSPS-1.4 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotPossible, with conditions
Zoned C-RSPS-1.4, a single-family residential zone. Alquist-Priolo Earthquake Fault Zone covers all of the lot: the project must meet the seismic building standards, and a fault study is usually required. FEMA Special Flood Hazard Area (Zone VE) covers about 98% of the lot: the project must meet the National Flood Insurance Program floodplain standards, or the lot needs a map revision.
- SB 9: split into two lotsPossible, with conditions
Zoned C-RSPS-1.4, a single-family residential zone. The lot is 28,401 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original. Alquist-Priolo Earthquake Fault Zone covers all of the lot: the project must meet the seismic building standards, and a fault study is usually required. FEMA Special Flood Hazard Area (Zone VE) covers about 98% of the lot: the project must meet the National Flood Insurance Program floodplain standards, or the lot needs a map revision.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- Not in a State-mapped fire hazard severity zone
- FEMA National Flood Hazard Layer
- Zone VE: 1% annual chance flood (Special Flood Hazard Area) (about 98% of the lot); Zone X: 0.2% annual chance flood hazard (shaded X) (about 2% of the lot) · FIRM panel 06041C0441E, effective August 15, 2017
- CGS Alquist-Priolo Earthquake Fault Zone
- Alquist-Priolo Earthquake Fault Zone (Bolinas quadrangle) (all of the lot)
Surrounding Rent & Value Benchmarks (Public Records)
Range: $2,893,000 – $3,681,000 · Status: Off market
HUD Small Area FMR (ZIP 94970) · FY 2026
Studio $2,090 · 1BR $2,510 · 2BR $3,030 · 3BR $3,870 · 4BR $4,010
Developments Deserving Closer Investigation & Active Area Builders
- New home at 52 Crescente Ave (Applied)0.35 mi W
In "Applied" for 2.3 yr (since Jul 11, 2024), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121). High-impact scale (1 housing unit, $2,750,000 declared valuation across 1 permit).
- New garage / accessory structure (84622) (Applied)On this parcel
Pending in review for 7 yr (15.6× the 164d median) — slower than 90% of new garage / accessory structure permits in Unincorporated Marin (median 164d, 90th pct 485d, n=356).
- Addition (adds square footage) (80637) (Applied)On this parcel
Pending in review for 9.2 yr (21.1× the 160d median) — slower than 90% of addition (adds square footage) permits in Unincorporated Marin (median 160d, 90th pct 440d, n=316).
- New home at 342 Seadrift Rd (Issued)320 ft E
Active in "Issued" for 8 yr (first record Nov 8, 2018) with no new permit activity recorded in 7.8 yr. High-impact scale (1 housing unit, $1,200,000 declared valuation across 1 permit).
Entity-resolved builders & contractors in ½ mile: Gubbins Building (1 on parcel, 6 in ½ mi · Remodel / interior alteration); Bellows Plumbing Heating And Air (1 on parcel, 1 in ½ mi · Other); Owner (7 in ½ mi · Commercial tenant improvement); Owner Builder (6 in ½ mi · New single-family home); Kasten Builders (5 in ½ mi · New single-family home).
Permit & Project History on This Parcel (4 permits, 0 grouped projects)
| Record # | Category | Status | Applied / Issued | Valuation | Description |
|---|---|---|---|---|---|
| B48791 | Other | Issued | Iss. Oct 15, 2026 | $9,441 | Replace Mechanical Appliance |
| B34613 | Windows / doors / siding | Issued | Iss. Jul 8, 2023 | $185,000 | 1. Replace all windows and doors on exterior of building 2. Replace exterior siding — Siding Replacement, Non-structural… |
| 84622 | New garage / accessory structure | Applied | App. Nov 18, 2019 | $1,725,000 | Whole House Remdl, Reduce Size Of Garage, New Decks |
| 80637 | Addition (adds square footage) | Applied | App. Aug 22, 2017 | $1,500,000 | Remod & Addtn***Expired***Withdrawn Per Architect 11/17/19 |